Ziegler Power Systems Advanced Electrical Services (AES) delivers you peace of mind when it comes to your critical power needs. Our focus on reliability and safety ensures that there are no weak links in your system and keeps your operation online and moving forward. We offer a comprehensive solution that goes beyond generation to make sure power is delivered where it needs to go. Maintenance and testing plans are tailored to your individual needs and align with the highest industry standards. AES is here to maximize the uptime and productivity of your power generation and delivery systems.


With around-the-clock support, our certified field service technicians are available for on-site or emergency service 24 hours a day, seven days a week.

Critical Equipment We Service

  • Automatic Transfer Switches
  • Paralleling Switchgear (Up to 15 kV)
  • Circuit Breakers (Up to 15kV)
  • Transformers
  • Protective Relays
  • Battery Systems (UPS and Station)
  • Electric AC/DC Motors
  • Cable and Bus Testing (Up to 15 kV)
  • Power Quality Analysis



Non-Emergency: 888.724.3053
24/7 Emergency: 888.320.4292

Contact Us


Non-Emergency: 888.659.9328
24/7 Emergency:

Contact Us

Non-emergency calls answered 8 a.m. to 4 p.m., Monday through Friday.


Non-Emergency: 888.724.3053

Non-emergency calls answered 8 a.m. to 4 p.m., Monday through Friday.

24/7 Emergency: 888.320.4292

Contact Us


Non-Emergency: 888.659.9328

Non-emergency calls answered 8 a.m. to 4 p.m., Monday through Friday.

24/7 Emergency: 800.342.7002

Contact Us


  • Healthcare
  • Utilities and Municipalities
  • Data Centers
  • Electrical Contractors
  • Electrical Distributors
  • Government
  • Renewables
  • Manufacturing
  • Commercial
  • Construction


Maintenance and Testing

Customer Value Agreements

Customer Value Agreements (CVA) represent a comprehensive power system reliability program featuring individualized customer solutions for parts, services, and digital technology. A CVA provides service for your entire system with one call and features a custom schedule based on individual needs and industry standards — we’ll call you to schedule service based on your availability. Budget-friendly, there are opportunities to bundle and save and payment plans with flexible terms.

Planned Outage Projects

AES can help with your planned outage projects by providing de-energized services, emergency system support, and rental power and distribution equipment.

  • Automatic Transfer Switches

    Regular inspections of your Automatic Transfer Switch (ATS) will prepare your facility for a seamless transition from your main and backup power supplies in the event of a power failure. Ziegler Power Systems Advanced Electrical Services technicians can conduct ATS maintenance with or without de-energizing your electrical distribution equipment.

    Testing is conducted in accordance with National Fire Protection Association (NFPA) 70B and 110 standards and American National Standards Institute (ANSI) Maintenance Testing Specifications.

    Energized Inspection

    • Check anchorage, alignment, grounding, clearances, and for evidence of arcing
    • Verify labeling and compliance with NFPA 70E safety standards
    • Perform infrared thermography testing on all electrical connections, checking for hot spots and areas of high resistance
    • Verify operation of timers and remote start contacts (requires load transfer)
    • Perform transfer test (requires load transfer)
    • Check voltage drop across utility and emergency generator contacts (requires load transfer)
    • Recommended frequency: Every 12 months

    De-Energized Inspection

    • Clean contacts, switch, and enclosure
    • Check for loose terminals and contacts
    • Lubricate current-carrying components of the switch
    • Perform insulation and contact resistance testing
    • Recommended frequency: Every 12 months


  • Paralleling Switchgear (Up to 15 kV)

    As an essential part of your electric distribution system, switchgear is engineered to safely and reliably manage your power through complex sequencing. Ziegler Power Systems Advanced Electrical Services technicians meticulously care for every critical component of your switchgear and power distribution system to help prevent unexpected equipment failures.

    Ziegler also provides switchgear acceptance testing on new equipment to ensure it functions properly and meets the specified requirements for its design.

    Switchgear Inspection, Maintenance, and Testing

    • Clean and inspect physical and mechanical condition
    • Determine accuracy of meters and calibrate as applicable
    • Check anchorage, alignment, clearances, and grounding

    Switchgear Mode/Operation Testing

    • Test the sequence of operation
    • Run a complete functional test to verify correct operation
    • Confirm all equipment corresponds with drawings and coordination

    Recommended maintenance frequency varies; contact Ziegler for more information.

  • Circuit Breakers (Up to 15kV)

    Did you know that poor circuit breaker maintenance is the leading cause of unscheduled power outages? Ziegler Power Systems can help mitigate the risk of an unexpected failure and support the reliability of your critical power with low- and medium-voltage circuit breaker testing. We offer maintenance services in the field and in the shop as well as primary/secondary injection performance testing.

    Onsite Circuit Breaker Maintenance and Testing

    1. Circuit breaker analysis
    2. Primary and secondary injection performance testing

    Express Bench Testing Program

    1. Send your circuit breaker into one of our two power systems locations, or drop it off at a local branch within our coverage area.
    2. We perform the necessary maintenance and testing service in our shop.
    3. You will receive a comprehensive report detailing the performance of your circuit breaker. If there are concerns or recommended repairs, one of our specialists will contact you directly to provide a solution.
    4. We will ship the unit back to you or return to your local branch, ready for pickup.

    Express Bench Testing Program requires prior quote and authorization. Circuit breakers are typically ready to return within 24 to 48 hours. Please contact us for the most up-to-date turnaround times.

  • Transformers

    Protect your critical power supply system with Advanced Electrical Services from Ziegler Power Systems. Ziegler-certified Advanced Electrical Services technicians collect and interpret data from your transformer for end-of-life planning, which can help prevent unexpected downtime, catastrophic failure, and major financial consequences.

    Liquid-Filled Transformer Oil Analysis

    • Assess the electrical and mechanical condition of your equipment to predict future repairs or replacements
    • Recommended frequency: Every 12 months

    Transformer Inspection, Maintenance, and Testing

    • Clean, inspect, and verify proper operation
    • Conduct electrical testing, including turns ratio, power factor, and resistance
    • Recommended frequency: Every 24 months
  • Protective Relays

    Properly functioning protective relays are crucial to the performance and safety of your critical power system. Ziegler Power Systems can help you protect your power with comprehensive protective relay inspection, maintenance, and testing. Ziegler-certified Advanced Electrical Services technicians have experience with a variety of relays, including microprocessor, electromechanical, and solid state.

  • Battery Systems (UPS and Station)

    Enhance the reliability of your battery system with maintenance from Ziegler Power Systems. Ziegler provides testing solutions and planned maintenance for both valve-regulated lead acid (VRLA) and vented lead acid (VLA) battery systems. Ziegler-certified Advanced Electrical Services technicians collect and interpret data from your system to trend results over time and prevent unexpected failures.

    UPS Inspection and Testing

    • Conduct inspection and testing of UPS device
    • Recommended frequency: Every three to 12 months

    Battery Impedance Testing

    • Conduct battery inspection and maintenance
    • Perform impedance testing and record ohmic trending values
    • Recommended frequency: Every six to 12 months

    Battery Capacity Testing

    • Perform capacity discharge testing
    • Measure the true performance of each battery
    • Recommended frequency: Every 24 to 36 months

    Testing is conducted in accordance with industry standards set by the Institute of Electrical and Electronics Engineers (IEEE), North American Electric Reliability Corporation (NERC), and National Fire Protection Association (NFPA).

  • Electric AC/DC Motors

    Electric Motor Circuit Evaluation (MCE) is working to help keep your equipment in production mode. This process is used to help detect problems before they may occur and to help limit your downtime, especially when you are busiest. We identify failures, including:

    • Phase to phase
    • Phase to ground
    • Winding short
    • Insulation
    • Breakdown/failure
    • Imbalance
    • Overheating
    • Bearing failure
    • Detect abnormal amplitudes of various known fault-frequencies
  • Cable and Bus Testing (Up to 15 kV)

    Cable and bus testing services include:

    • Low- and medium-voltage cable services
    • Inspection
    • Resistance measurements through bolted connections
    • Insulation resistance testing
    • Dielectric withstand tests
    • Diagnostics
  • Power Quality Analysis

    Power quality analysis helps solve problems that you can’t normally see but can cause issues for your critical equipment or operation. When a power quality anomaly occurs, we can monitor your system to troubleshoot the downstream or upstream to the source.

  • Arc Flash Labeling

    Are your labels NFPA 70E compliant?

    Make sure your arc flash safety labels are doing their job! Ziegler Power Systems, along with our expert partners, can help ensure that your equipment has arc flash labelling in compliance with the latest NFPA and OSHA requirements. Contact us today to schedule a free consultation!

Upgrades and Retrofits

Extending the Life of Your Equipment

The long-term reliability of your equipment is important. We can help you get the longest life possible out of your existing equipment. Upgrade and retrofit solutions may be a viable solution when full replacement is not an option.

  • Circuit Breakers
    • Critical spares
    • Replacements
    • Reconditioning
    • Advanced testing and maintenance (in-shop and field)
  • Components

    Component, PLC, and controls upgrades for switchgear, transfer switches, and protective relays.

Generator Reconditioning

Extend the Life of Your Generator

Comprehensive generator reconditioning services from Ziegler Power Systems extend a generator’s life and reliability to help keep our customers’ equipment operating at peak performance.

  • When to Consider Reconditioning a Generator

    The most critical time to recondition a generator is when its engine is being overhauled, ensuring that the age of both units match. This will save time and money. A recondition is also recommended when the equipment has been used in a harsh environment or has high hours of operation.

  • Reconditioning Process

    When a generator comes in for reconditioning services, we’ll conduct an initial, thorough inspection and a series of electrical tests to assess the equipment and produce a quote.

  • Generator Reconditioning Services
    • Two rounds of electrical testing on all major components, including rotor, stator, and exciter
    • Disassembly, cleaning, and inspection of all components
    • Replacement of bearings
    • Application of rotor, stator, and exciter epoxy insulations
    • Component baking to remove moisture and ensure consistent and properly- adhering insulation coverage

    Additional Options

    • Exterior repaint
    • Special rotor, stator, and exciter coatings for abrasive environments
    • Generator circuit breaker testing to ensure proper function

Maximize Power Reliability and Safety

Safety is a core value at Ziegler CAT. We offer a complete package of electrical services to assist you in maximizing your power reliability and safety. We provide compliance testing to help ensure employee safety, minimize unplanned outages, and prevent loss of productivity and help ensure that your equipment has arc flash labelling in compliance with the latest NFPA and OSHA requirements.